The study proposes to assess whether compared to placebo, CP-690,550 is effective, safe, and tolerable maintenance therapy in subjects with Ulcerative Colitis (UC). The study proposes to assess whether compared to placebo, CP-690,550 maintenance therapy more effectively achieves mucosal healing and improves quality of life in subjects with UC.The study proposes to assess CP-690,550 pharmacokinetic exposure during maintenance therapy in subjects over the age of 18 years with UC.

Remission in participants was defined by a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point and a rectal bleeding subscore of 0. Mayo score was an instrument designed to measure disease activity of ulcerative colitis (UC). It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and physician global assessment (PGA), each subscore graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12 where higher score indicating higher disease severity.

Mucosal healing in participants was defined by mayo endoscopic subscore of 0 or 1. The mayo endoscopic subscore consisted of the findings of centrally read flexible sigmoidoscopy, graded from 0 to 3 with higher subscores indicating higher disease severity.

Percentage of Participants With Sustained Steroid-Free Remission (Defined as Being in Remission and Steroid-Free at Both Week 24 and 52), Among Participants With Remission at Baseline [ Time Frame: Week 24, 52 ]

Sustained steroid-free remission was defined by being in remission and steroid-free at both Week 24 and Week 52. Steroid-free remission was defined by being in remission, in addition to no requirement of any treatment with steroid for at least 4 weeks prior to the visit. Remission was defined by a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point and a rectal bleeding subscore of 0. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity. Percentage of participants with sustained steroid-free remission (among participants with remission at baseline) were reported in this outcome measure.

Remission in participants was defined by a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point and a rectal bleeding subscore of 0. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher subscores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity.

Sustained remission in participants was defined by being in remission at both Week 24 and Week 52. Remission was defined by a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point and a rectal bleeding subscore of 0. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher subscores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher score indicating higher disease severity.

Mucosal healing in participants was defined by a mayo endoscopic subscore of 0 or 1. The mayo endoscopic subscore consisted of the findings of centrally read flexible sigmoidoscopy, graded from 0 to 3 with higher scores indicating higher disease severity.

Clinical response was defined by a decrease from induction study (A3921094 [NCT01465763] or A3921095 [NCT01458951]) baseline in Mayo score of at least 3 points and at least 30%, with an accompanying decrease in the rectal bleeding subscore of at least 1 point, or an absolute rectal bleeding subscore of 0 or 1. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity. Percentage of participants with clinical response at Week 24 and 52 have been reported in this outcome measure.

Sustained clinical response in participants was defined as showing clinical response at both Week 24 and Week 52. Clinical response was defined by a decrease from induction study (A3921094 [NCT01465763] or A3921095 [NCT01458951]) baseline in mayo score of at least 3 points and at least 30%, with an accompanying decrease in the rectal bleeding subscore of at least 1 point, or an absolute rectal bleeding subscore of 0 or 1. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity. Percentage of participants with sustained clinical response are reported in this outcome measure.

Clinical remission in participants was defined as a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity.

Sustained clinical remission in participants was defined as being in clinical remission at both Week 24 and Week 52. Clinical remission was defined by a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity.

Deep remission in participants was defined as a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point and 0 subscore for both rectal bleeding and endoscopic subscores. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity.

Sustained deep remission was defined by being in deep remission at both Week 24 and Week 52. Deep remission in participants was defined as a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point and 0 subscore for both rectal bleeding and endoscopic subscores. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity.

Symptomatic remission in participants was defined as a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point, and 0 subscore for both rectal bleeding and stool frequency. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 sub-scores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity.

Sustained symptomatic remission in participants was defined as being in symptomatic remission at both Week 24 and Week 52. Symptomatic remission was defined as a total Mayo score of 2 points or lower, with no individual subscore exceeding 1 point, and 0 subscore for both rectal bleeding and stool frequency. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity.

Sustained endoscopic remission in participants was defined as being in endoscopic remission at both Week 24 and Week 52. Endoscopic remission was defined by a mayo endoscopic subscore of 0. The mayo endoscopic subscore consisted of the findings of centrally read flexible sigmoidoscopy, graded from 0 to 3 with higher subscores indicating higher disease severity.

Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity.

Change From Baseline in Total Mayo Score at Week 24 and 52 [ Time Frame: Baseline, Week 24, 52 ]

Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity. Change from baseline in total mayo score at Week 24 and 52 was reported.

Percentage of Participants in Remission, Among Participants With Remission at Baseline [ Time Frame: Week 24, 52 ]

Remission in participants was defined by a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point and a rectal bleeding subscore of 0. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher score indicating higher disease severity.

Percentage of Participants in Sustained Remission, Among Participants With Remission at Baseline [ Time Frame: Week 24, 52 ]

Sustained remission in participants was defined by being in remission at both Week 24 and Week 52. Remission was defined as a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point and a rectal bleeding subscore of 0. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher score indicating higher disease severity.

Percentage of Participants in Steroid-free Remission, Among Participants in Remission at Baseline [ Time Frame: Week 24, 52 ]

Steroid-free remission was defined by being in remission, in addition to no requirement of any treatment with steroid for at least 4 weeks prior to the visit. Remission was defined by a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point and a rectal bleeding subscore of 0. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity. Percentage of participants in steroid-free remission were reported in this outcome measure.

Steroid-free remission was defined by being in remission, in addition to no requirement of any treatment with steroid for at least 4 weeks prior to the visit. Remission was defined by a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point and a rectal bleeding subscore of 0. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity. Percentage of participants with steroid-free remission were reported in this outcome measure.

Sustained steroid-free remission was defined by being in remission and steroid-free at both Week 24 and Week 52. Steroid-free remission was defined by being in remission, in addition to no requirement of any treatment with steroid for at least 4 weeks prior to the visit. Remission was defined by a total mayo score of 2 points or lower, with no individual subscore exceeding 1 point and a rectal bleeding subscore of 0. Mayo score was an instrument designed to measure disease activity of UC. It consisted of 4 subscores: stool frequency, rectal bleeding, findings of centrally read flexible sigmoidoscopy and PGA, each graded from 0 to 3 with higher scores indicating higher disease severity. These subscores were summed up to give a total score range of 0 to 12, where higher scores indicating higher disease severity. Percentage of participants with sustained steroid-free remission were reported in this outcome measure.

Subjects who have had surgery for UC or in the opinion of the investigator, are likely to require surgery for UC during the study period.

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Please refer to this study by its ClinicalTrials.gov identifier: NCT01458574